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Are Aliens Among Us?

In pursuit of evidence that life arose on Earth more than once, scientists are searching for microbes that are radically different from all known organisms

By Paul Davies

Radiant Information

State-of-the-art light microscopy illuminates the exquisite details of life

By Emily Harrison

Window on the Extreme Universe

The GLAST satellite is about to open up an unexplored region of the electromagnetic spectrum--just the region, in fact, where signs of dark matter and other mysterious phenomena may show up

By William B. Atwood, Peter F. Michelson and Steven Ritz

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